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8. Firewalls, generally, are configured for all interfaces on a device. When configured, firewalls generate a large amount of
flow tables that store information on the traffic that is allowed to traverse through the firewall. These flow tables occupy
a large portion of the limited memory on the device that could be used for other critical purposes. With the Per VLAN
firewall feature enabled on an interface, flow tables are only generated for that interface, Flow tables are not generated
for those interfaces where this feature is not enabled. This frees up memory that can be used for other purposes.
Firewall can be switched off for those interfaces which are known to carry trusted traffic and only enabled on the interfaces
that can provide a vector for an attack on the network. Select the
Per VLAN Firewall
option to enable firewall on this
interface.
9. Broadcast Optimization prevents flooding of ARP packets over the virtual interface. Based on the learned information, ARP
packets are filtered at the wireless controller level.
Select the
L2 Tunnel Broadcast Optimization
option to prevent flooding of ARP packets on this bridge interface.
10. Define the following
Extended VLAN Tunnel
parameters:
11. Define the following
Layer 2 Firewall
parameters:
12. Select the
OK
button located at the bottom right of the screen to save the changes. Select
Reset
to revert to the last saved
configuration.
Bridging Mode
Specify one of the following bridging mode for use on the VLAN:
•
Automatic
: Select Automatic mode to let the access point determine the best
bridging mode for the VLAN.
•
Local
: Select Local to use local bridging mode for bridging traffic on the VLAN.
•
Tunnel
: Select Tunnel to use a shared tunnel for bridging traffic on the VLAN. Tunnel
must be selected to successfully create a mesh connection between two Standalone
APs.
•
isolated-tunnel
: Select isolated-tunnel to use a dedicated tunnel for bridging traffic
on the VLAN.
IP Outbound Tunnel ACL
Select an
IP Outbound Tunnel ACL
for outbound traffic from the drop-down menu. If an
appropriate outbound IP ACL is not available select the create icon to make a new one.
MAC Outbound Tunnel ACL
Select a
MAC Outbound Tunnel ACL
for outbound traffic from the drop-down menu. If
an appropriate outbound MAC ACL is not available select the create icon to make a new
one.
NOTE:
If creating a mesh connection between two access points in Standalone AP
mode,
Tunnel
must be selected as the Bridging Mode to successfully create the mesh
link between the two access points.
Trust ARP Response
Select this option to use trusted ARP packets to update the DHCP Snoop Table to
prevent IP spoof and arp-cache poisoning attacks. This feature is disabled by default.
Trust DHCP Responses
Select this option to use DHCP packets from a DHCP server as trusted and permissible
within the network. DHCP packets are used to update the DHCP Snoop Table to prevent
IP spoof attacks. This feature is disabled by default.
Enable Edge VLAN Mode
Select this option to enable edge VLAN mode. When selected, the IP address in the
VLAN is not used for normal operations, as its now designated to isolate devices and
prevent connectivity. This feature is enabled by default.
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